Abstract
X-Ray absorption fine structure measurements, and computer simulations were used to solve the structure of mixed salts RbBr x Cl 1− x . Deviations from the average NaCl structure (nearest neighbor distances and buckling angles) were observed which maximize in the midst of the concentration range. This induces a local elastic strain energy which is the cause of the melting point depression below the linear interpolation. It is shown for the first time that the concentration-weighted average of the RbBr and RbCl bond lengths is always greater than the average determined by diffraction.
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